I just got finished putting this ARF together. You are right about the servos. I was going to use Futaba 3004's, but they wouldn't fit the slots provided unless you trimmed them out. I did open the slot in the wing panels to use the 3004's, but didn't want take the time to open the ones in the fuselage so I went to the LHS and bought the JR 521's and they dropped right in. There is the slightest dimension difference and the JR's won out. I plugged them right into my Futaba R617 rx, using the 7C tx, a Saito .91 in the nose and it is a blast to fly!

Have fun.